Total Cloud Cover Average Cloud Amount (%) December, January, February (1954 - 1997) Day, Ship Observations Only Global Average: 67.4 Zonal Averages 17 zones Lat.N Average 85 56.5 75 68.7 65 82.8 55 82.3 45 79.5 35 71.7 25 59.1 15 51.8 5 62.8 -5 59.9 -15 60.3 -25 60.3 -35 66.0 -45 77.5 -55 85.4 -65 87.4 -75 80.8 Grid Box Averages 395 filled boxes Box # Lat.N Lon.E Average 1 85 60 63.3 2 85 180 55.3 3 85 300 48.8 4 75 20 85.1 5 75 60 83.2 6 75 100 57.1 7 75 140 53.7 8 75 180 56.7 9 75 220 63.8 11 75 300 66.8 12 75 340 79.6 13 65 10 81.0 14 65 30 80.7 15 65 50 81.7 21 65 170 78.7 22 65 190 85.8 23 65 210 76.5 27 65 290 82.2 28 65 310 80.7 29 65 330 84.2 30 65 350 83.5 31 55 10 77.1 32 55 30 80.0 37 55 130 71.6 38 55 150 78.5 39 55 170 82.1 40 55 190 83.2 41 55 210 84.5 42 55 230 83.8 45 55 290 74.5 46 55 310 86.9 47 55 330 83.2 48 55 350 79.8 49 45 5 59.1 50 45 15 61.7 51 45 25 72.0 52 45 35 74.8 53 45 45 75.5 54 45 55 71.9 61 45 125 54.7 62 45 135 60.7 63 45 145 74.2 64 45 155 82.7 65 45 165 81.4 66 45 175 80.2 67 45 185 80.2 68 45 195 80.8 69 45 205 83.2 70 45 215 83.2 71 45 225 82.9 72 45 235 77.9 77 45 285 65.7 78 45 295 77.9 79 45 305 83.5 80 45 315 85.1 81 45 325 81.5 82 45 335 79.7 83 45 345 77.9 84 45 355 75.5 85 35 5 58.4 86 35 15 60.8 87 35 25 61.2 88 35 35 55.6 89 35 45 70.8 90 35 55 63.2 96 35 115 36.9 97 35 125 65.1 98 35 135 71.4 99 35 145 71.6 100 35 155 76.8 101 35 165 75.2 102 35 175 74.0 103 35 185 74.2 104 35 195 75.5 105 35 205 76.6 106 35 215 77.4 107 35 225 77.2 108 35 235 67.5 109 35 245 51.7 112 35 275 59.2 113 35 285 70.9 114 35 295 78.3 115 35 305 74.8 116 35 315 72.4 117 35 325 71.5 118 35 335 71.7 119 35 345 66.4 120 35 355 55.1 124 25 35 31.7 125 25 45 44.9 126 25 55 33.1 127 25 65 26.2 128 25 75 17.3 129 25 85 29.3 130 25 95 27.9 131 25 105 85.1 132 25 115 74.1 133 25 125 75.5 134 25 135 67.2 135 25 145 62.1 136 25 155 61.8 137 25 165 59.0 138 25 175 58.7 139 25 185 58.2 140 25 195 59.3 141 25 205 61.0 142 25 215 67.2 143 25 225 71.4 144 25 235 70.7 145 25 245 49.4 146 25 255 47.4 147 25 265 63.9 148 25 275 57.4 149 25 285 57.4 150 25 295 54.8 151 25 305 54.9 152 25 315 56.9 153 25 325 58.5 154 25 335 55.1 155 25 345 40.3 156 25 355 53.5 160 15 35 41.5 161 15 45 33.5 162 15 55 34.5 163 15 65 33.6 164 15 75 28.3 165 15 85 42.9 166 15 95 37.1 167 15 105 69.0 168 15 115 59.9 169 15 125 62.0 170 15 135 62.1 171 15 145 56.5 172 15 155 52.7 173 15 165 50.4 174 15 175 51.1 175 15 185 51.7 176 15 195 53.7 177 15 205 55.2 178 15 215 62.0 179 15 225 67.9 180 15 235 71.0 181 15 245 63.7 182 15 255 41.8 183 15 265 27.8 184 15 275 42.5 185 15 285 48.1 186 15 295 48.1 187 15 305 49.7 188 15 315 52.5 189 15 325 58.2 190 15 335 52.4 191 15 345 37.4 193 5 5 64.1 197 5 45 43.3 198 5 55 47.8 199 5 65 48.1 200 5 75 48.7 201 5 85 63.0 202 5 95 65.7 203 5 105 70.5 204 5 115 70.0 205 5 125 65.9 206 5 135 68.9 207 5 145 67.3 208 5 155 68.3 209 5 165 68.6 210 5 175 68.1 211 5 185 66.7 212 5 195 63.4 213 5 205 65.1 214 5 215 67.0 215 5 225 66.1 216 5 235 67.3 217 5 245 64.5 218 5 255 58.3 219 5 265 55.1 220 5 275 50.5 221 5 285 58.1 222 5 295 57.0 223 5 305 59.3 224 5 315 68.8 225 5 325 69.2 226 5 335 68.0 227 5 345 54.1 228 5 355 62.4 229 -5 5 65.5 230 -5 15 71.4 232 -5 35 51.0 233 -5 45 50.9 234 -5 55 58.7 235 -5 65 61.6 236 -5 75 66.1 237 -5 85 67.2 238 -5 95 70.8 239 -5 105 77.0 240 -5 115 76.4 241 -5 125 70.8 242 -5 135 73.9 243 -5 145 75.3 244 -5 155 71.3 245 -5 165 72.6 246 -5 175 71.6 247 -5 185 65.3 248 -5 195 57.8 249 -5 205 51.6 250 -5 215 46.5 251 -5 225 43.7 252 -5 235 42.1 253 -5 245 46.3 254 -5 255 52.6 255 -5 265 55.9 256 -5 275 55.6 257 -5 285 54.3 260 -5 315 62.7 261 -5 325 54.1 262 -5 335 52.0 263 -5 345 51.9 264 -5 355 55.2 265 -15 5 67.8 266 -15 15 64.8 268 -15 35 56.2 269 -15 45 62.4 270 -15 55 59.4 271 -15 65 58.3 272 -15 75 61.5 273 -15 85 60.2 274 -15 95 61.4 275 -15 105 61.9 276 -15 115 54.1 277 -15 125 66.0 278 -15 135 72.8 279 -15 145 66.3 280 -15 155 62.0 281 -15 165 64.3 282 -15 175 66.6 283 -15 185 69.6 284 -15 195 68.8 285 -15 205 65.6 286 -15 215 62.3 287 -15 225 54.1 288 -15 235 50.9 289 -15 245 51.6 290 -15 255 53.9 291 -15 265 56.4 292 -15 275 62.0 293 -15 285 62.9 297 -15 325 56.0 298 -15 335 50.4 299 -15 345 53.0 300 -15 355 61.3 301 -25 5 61.6 302 -25 15 59.8 304 -25 35 54.4 305 -25 45 55.0 306 -25 55 58.3 307 -25 65 56.8 308 -25 75 55.1 309 -25 85 56.7 310 -25 95 61.6 311 -25 105 66.8 312 -25 115 42.3 315 -25 145 59.4 316 -25 155 57.5 317 -25 165 58.9 318 -25 175 62.9 319 -25 185 65.5 320 -25 195 66.5 321 -25 205 69.7 322 -25 215 67.9 323 -25 225 63.3 324 -25 235 57.8 325 -25 245 54.3 326 -25 255 54.0 327 -25 265 57.1 328 -25 275 67.0 329 -25 285 75.0 332 -25 315 61.1 333 -25 325 61.9 334 -25 335 58.6 335 -25 345 52.2 336 -25 355 55.9 337 -35 5 62.5 338 -35 15 50.6 339 -35 25 55.2 340 -35 35 61.1 341 -35 45 62.9 342 -35 55 65.8 343 -35 65 66.6 344 -35 75 66.4 345 -35 85 66.7 346 -35 95 68.4 347 -35 105 72.8 348 -35 115 56.0 349 -35 125 68.5 350 -35 135 65.5 351 -35 145 57.8 352 -35 155 60.1 353 -35 165 64.4 354 -35 175 59.8 355 -35 185 64.4 356 -35 195 70.8 357 -35 205 71.9 358 -35 215 73.4 359 -35 225 73.8 360 -35 235 68.7 361 -35 245 68.0 362 -35 255 71.6 363 -35 265 68.2 364 -35 275 72.5 365 -35 285 69.3 366 -35 295 48.3 367 -35 305 53.9 368 -35 315 61.3 369 -35 325 68.2 370 -35 335 69.0 371 -35 345 67.8 372 -35 355 64.1 373 -45 5 82.8 374 -45 15 81.5 375 -45 25 80.8 376 -45 35 81.3 377 -45 45 78.1 378 -45 55 79.9 379 -45 65 80.8 380 -45 75 78.5 381 -45 85 82.5 382 -45 95 81.0 383 -45 105 81.6 384 -45 115 78.2 385 -45 125 79.2 386 -45 135 78.1 387 -45 145 69.8 388 -45 155 71.2 389 -45 165 76.7 390 -45 175 64.8 391 -45 185 72.9 392 -45 195 78.4 393 -45 205 78.8 394 -45 215 81.4 395 -45 225 81.2 396 -45 235 82.7 397 -45 245 81.8 398 -45 255 82.5 399 -45 265 79.3 400 -45 275 75.0 401 -45 285 78.5 402 -45 295 54.8 403 -45 305 60.1 404 -45 315 69.7 405 -45 325 76.0 406 -45 335 78.4 407 -45 345 78.9 408 -45 355 80.9 409 -55 10 88.5 410 -55 30 89.1 411 -55 50 87.5 412 -55 70 85.8 413 -55 90 88.4 414 -55 110 85.5 415 -55 130 83.9 416 -55 150 86.1 417 -55 170 83.9 418 -55 190 84.6 419 -55 210 86.7 420 -55 230 88.2 421 -55 250 83.1 422 -55 270 83.0 423 -55 290 76.2 424 -55 310 80.7 425 -55 330 85.8 426 -55 350 88.0 427 -65 10 83.4 428 -65 30 73.8 429 -65 50 79.0 430 -65 70 80.6 431 -65 90 86.3 432 -65 110 84.1 433 -65 130 87.6 434 -65 150 87.6 435 -65 170 90.0 436 -65 190 91.3 437 -65 210 92.3 438 -65 230 93.7 439 -65 250 92.4 440 -65 270 90.6 441 -65 290 84.1 442 -65 310 89.5 443 -65 330 92.8 444 -65 350 87.4 449 -75 180 73.2 450 -75 220 88.2 451 -75 260 89.2 452 -75 300 80.3 453 -75 340 77.3